EP0569085B1 - Hilfsmittel zur Kontrolle von Harz- und klebrigen Ablagerungen - Google Patents

Hilfsmittel zur Kontrolle von Harz- und klebrigen Ablagerungen Download PDF

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Publication number
EP0569085B1
EP0569085B1 EP93201240A EP93201240A EP0569085B1 EP 0569085 B1 EP0569085 B1 EP 0569085B1 EP 93201240 A EP93201240 A EP 93201240A EP 93201240 A EP93201240 A EP 93201240A EP 0569085 B1 EP0569085 B1 EP 0569085B1
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Prior art keywords
pitch
stickies
machinery
papermaking
equipment
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French (fr)
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EP0569085A1 (de
Inventor
Paul F. Richardson
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Calgon Corp
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Calgon Corp
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Priority claimed from US07/878,637 external-priority patent/US5286347A/en
Priority claimed from US08/023,988 external-priority patent/US5433824A/en
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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
    • D21C9/08—Removal of fats, resins, pitch or waxes; Chemical or physical purification, i.e. refining, of crude cellulose by removing non-cellulosic contaminants, optionally combined with bleaching
    • D21C9/086—Removal of fats, resins, pitch or waxes; Chemical or physical purification, i.e. refining, of crude cellulose by removing non-cellulosic contaminants, optionally combined with bleaching with organic compounds or compositions comprising organic compounds
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/20—Macromolecular organic compounds
    • D21H17/33—Synthetic macromolecular compounds
    • D21H17/46—Synthetic macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • D21H17/47—Condensation polymers of aldehydes or ketones
    • D21H17/49—Condensation polymers of aldehydes or ketones with compounds containing hydrogen bound to nitrogen
    • D21H17/51—Triazines, e.g. melamine
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/02—Agents for preventing deposition on the paper mill equipment, e.g. pitch or slime control

Definitions

  • the present invention relates to the use of melamine aldehyde-type polymers to inhibit and/or control pitch or stickies deposition in pulping and papermaking processes. More particularly, this invention relates to inhibiting the deposition of pitch on machinery used in pulping and papermaking processes and to the removal of pitch from machinery used in pulping and papermaking processes. This invention further relates to inhibiting the deposition of stickies on machinery used in secondary fiber pulping and papermaking processes and to the removal of stickies from machinery used in secondary fiber pulping and papermaking processes.
  • Pitch as used herein, maybe generally defined as any resin-based deposit of widely varying composition originating in the extractive fraction of wood.
  • the extractive fraction of wood is one of the four principal components of wood. The other three are cellulose, lignin, and hemicellulose.
  • the extractive fraction is defined as a complex mixture of substances which are soluble in water, alcohol, benzene, ether, and/or acetone.
  • the extractive fraction which generally makes up from about 3% to 10% of the weight of wood, contains such components as low molecular weight carbohydrates, terpenes, aromatic and aliphatic acids, alcohols, tannins, color substances, proteins, lignins, alkaloids, and soluble lignins.
  • stickies and tackies are interchangeable terms that primarily include synthetic contraries found in secondary fiber.
  • stickies and tackies include, but are not limited to, ink residuals, tars, latexes and heat melt contaminants found in secondary fiber.
  • stickies and tackies are distinct from pitch, which, as defined above, includes any resin-based deposit of widely varying constituency originating in the extractive fraction of wood. The constituents of pitch are naturally occurring, as opposed to the synthetic compounds that comprise stickies. While pitch and stickies cause similar problems in papermaking operations, they are distinct both in terms of their origin and their composition.
  • Pitch is a major problem in pulp and papermaking because it (1) agglomerates and also occludes other matter to form visible "dirt" in the final paper, (2) plates out and collects on machinery used in pulping and papermaking process such as screens, filters refining equipment, pulp washers, and paper machines, and (3) reduces pulp brightness and brightness stability.
  • the composition and amount of pitch deposited on pulping and papermaking machinery and in the final paper vary with the time of the year the trees are harvested, the type of wood, and the type of the pulping process used. For example, wood pulped from trees cut in the early spring and fall generally contains more pitch than wood pulped from trees cut at other times during the year.
  • Pitch deposited in softwood Kraft mills tends to have a relatively larger abietic acid to fatty acid-ester ratio than pitch found in hardwood Kraft mills, and pitch deposit problems are generally somewhat more severe in sulfite mills.
  • the sulfite pulping process removes only about one half of the resins and fatty esters leaving a considerable portion of these materials encapsulated within the cellulose fibers.
  • these encapsulated materials are released by the shearing forces of pulping and papermaking processes and thus pitch deposits are more prevalent in the stock preparation area and on the paper machine.
  • Pitch problems can be quite bothersome in mechanical pulp mills, including groundwood, TMP, CTMP, and semi-chemical pulping processes, particularly those that utilize softwoods. This is because there is little chemical degradation of the fatty acid esters and resin esters. Therefore, those materials are not washed out and tend to remain dispersed in the aqueous system of the pulping process.
  • Stickies and tackies are a major problem in secondary fiber pulp and papermaking operations because, like pitch, they (1) agglomerate and also occlude other matter to form visible "dirt" in the final paper, (2) plate out and collect on machinery used in pulping and papermaking process such as screens, filter refining requipment, pulp washers, and paper machines, and (3) reduce pulp brightness and brightness stability.
  • the composition and amount of stickies deposited on pulping and papermaking machinery and in the final paper vary with the type of secondary fiber used in the pulping operation.
  • the term "secondary fiber” includes any paper fiber used for a second time in the production of a paper end-product.
  • Sources of secondary fiber include, but are not limited to, tissue, fine paper, boxboard, linerboard, footboard and newsprint. Each of these sources generally contains unique impurities, such as inks, colors, fillers, strength resins and/or coatings, which means that the stickies composition and concentration can vary widely from one secondary fiber to another.
  • Crystallized calcium carbonate can provide nucleation sites for precipitated metal soaps thereby producing hydrophobic particles which coalesce with other particles to form a pitch deposit.
  • Zirconium chemicals have also been used to control pitch. See, for example, US-A-4,950,361.
  • the instant melamine formaldehyde-type polymers are widely used in water treatment, particularly in the treatment of paint spray booths. See, for example, US-A-4,656,059, 4,629,572, 4,935,149 and 5,068,279.
  • the present invention as described in claim 1 relates to the inhibition and/or control of pitch or stickies in papermaking operations.
  • pitch is defined as the material comprising naturally occurring resinous materials and gums liberated during the screening, heating and refining processes that occur during papermaking
  • stickies are defined as synthetic additives which enter into paper furnishes. More particularly, stickies are defined as adherent deposits caused by organic materials used in paper and board converting operations which are typically introduced into paper machine furnishes with recycled fibers.
  • the word "stickies" is derived from the fact that the resultant deposits stick to wires, felts, and other parts of paper machine.
  • Stickies are a diverse mixture of synthetic materials ranging from hot-melt and pressure-sensitive adhesives to binders and coatings for inks or wet strength resins.
  • Polymeric examples include, for example, polyethylenes, polybutadiene-styrenes, polyvinylacetates and polyacrylates.
  • the instant invention is directed to the inhibition of pitch or stickies deposits on and to the removal of pitch or stickies deposits from pulping and/or papermaking machinery, particularly wet-end papermaking machinery, comprising adding to a pulp slurry or paper furnish in contact with said machinery an effective amount of a designated melamine formaldehyde-type polymer.
  • the present invention relates to a method for inhibiting pitch deposition on pulping and papermaking equipment or machinery, and/or for removing existing pitch deposits from such equipment or machinery, comprising adding to a furnish, stock or papermaking stream containing pitch which contacts said equipment or machinery a water-insoluble melamine formaldehyde-type polymer acid colloid.
  • the present invention also relates to a method for controlling and/or inhibiting stickies and/or tackies deposition on secondary fiber papermaking equipment or machinery, and/or for removing existing stickies/tackies deposits from such equipment or machinery, comprising adding to a secondary fiber furnish, stock or papermaking stream containing stickies or tackies which contacts said equipment or machinery a water-insoluble melamine formaldehyde-type polymer acid colloid.
  • the melamine formaldehyde-type polymer acid colloid is a polymer comprising: (a), melamine or a substituted melamine; and (b) a compound described by the following formula: wherein R 1 and R 2 , which may be the same or different, are selected from the group consisting of H and straight or branched C 1-4 alkyl groups.
  • the preferred compounds of (b) comprise aldehydes, with methanal (formaldehyde), ethanal and propanal being especially preferred; the most preferred aldehyde is formaldehyde.
  • moderate amounts of additional moieties including, for example, urea and/or dicyandiamide, may be present in the melamine formaldehyde-type polymers of this invention.
  • the mole ratio of component (a) to component (b) should range from about 1:1 to about 1:6, with the preferred ratio being from about 1:1 to 1:3.
  • the most preferred mole ratio is about 1 mole of melamine or a derivative thereof to about 2 to 2.5 moles of an aldehyde.
  • the most preferred polymer is prepared from melamine and formaldehyde with the mole ratio of melamine to formaldehyde being about 1:2 to about 1:2.5.
  • the instant melamine-formaldehyde polymers are insoluble in water. They are therefore best utilized in acidic solutions wherein the melamine polymer is stabilized in a fine colloidal state of suspension.
  • Calgon's product CA-289 which has a pH of about 1.6 to about 2.1, is an example of the preferred form. This product contains 8% active melamine-formaldehyde polymer in an acidic aqueous solution. Any acid can be used to prepare the melamine aldehyde acid suspension, although hydrochloric acid is preferred. Also, other stabilizing agents, such as alcohols, can be used.
  • the percent by weight of active melamine polymer in a stabilized (acidic) suspension or solution should range from about 0.1% to about 20%, preferably 1% to about 15%, and most preferably about 4% to about 12%, due to cost and product stability considerations.
  • the pH should be sufficiently low to keep the melamine aldehyde-type polymer in a fine colloidal suspension.
  • the molecular weight of the melamine aldehyde-type polymer is not critical. However, the preferred molecular weight ranges from about 500 to about 50,000, and the most preferred molecular weight ranges from about 500 to about 5,000. As noted above, suitable melamine aldehyde-type polymers are commercially available from Calgon Corporation, under the tradenames CA-289 and WT-2511. These products have molecular weights of about 2,200.
  • an effective amount of the melamine formaldehyde-type polymer should be added to or maintained in the furnish, papermaking or secondary fiber stream being treated.
  • the melamine polymer interacts with the pitch or stickies contained in such streams, thereby inhibiting pitch or stickies deposition and/or removing existing pitch or stickies deposits from the surface of papermaking equipment.
  • the term "effective amount" refers to that amount of melamine formaldehyde-type polymer which achieves the desired inhibition or removal of pitch or stickies for a given system.
  • the melamine polymer can be applied intermittently or continuously to the papermaking stream being treated at a preferred dosage of at least about 4.54 x 10 -3 kg (0.01 lb.) polymer per 9.07 x 10 2 kg (ton) of dry fiber, on an active polymer basis. More preferably, the dosage should be maintained between about 0.18 kg/9.07 x 10 2 kg (0.40 lb/ton) to about 4.54 kg/9.07 x 10 2 kg (10.0 lb/ton).
  • the melamine formaldehyde-type polymer can be added at any convenient location, but is preferably added so as to allow the maximum contact between melamine formaldehyde-type polymer and the pitch or stickies.
  • the melamine formaldehyde-type polymer may be added to brown stock washers, deckers, high density chests or machine dilution chests. Also, multiple points of addition may dilution chests. Also, multiple points of addition may be used.
  • Calgon product CA-289 was fed to a small storage chest after the outside brown stock high density chest of a bleached softwood Kraftmill.
  • the trial used fresh wood chips.
  • the stock, after treatment, went through the screening room and eventually to the bleach plant.
  • the feed rate ranged from 0.91 to 4.54 kg (2 to 10 lb) of 8%, by weight, active polymer per 9.07 x 10 2 kg (ton) of furnish. This equates to a feed rate of about 0.07 to 0.36 kg per 9.07 x 10 2 kg (0.16 to about 0.8 lb per ton), on an active polymer basis.
  • a melamine-formaldehyde acid colloid commercially available from Calgon Corporation, was fed to a secondary fiber furnish prepared from a mixed office waste containing 3% by weight fiber, deinking chemicals, ink solids and bleach.
  • the polymer dosage on an active basis, was 0.30 kg/9.07 x 10 2 kg (.65 pounds/ton).
  • Hand sheets were then prepared from the treated and untreated furnishes.
  • the untreated hand sheeets contained large tacky particle with fiber attached to them.
  • the treated hand sheets contained smaller, non tacky particles with fewer fibers attached.

Claims (9)

  1. Verfahren zur Hemmung der Harz- oder Klebstoffablagerung auf einer Pulpen- und Papiermaschine bzw. -maschinenanlage und/oder zum Entfernen vorhandener Harz- oder Klebstoffablagerungen von dieser Maschine bzw. Maschinenanlage, umfassend
       das Zugeben zu einem Beschickungs-, Ausgangsstoff- oder Papierherstellungsstrom, der Harz oder Klebstoffe enthält und die Maschine bzw. die Maschinenanlage kontaktiert, eines wasserunlöslichen, sauren Kolloids eines Melamin-Formaldehyd-Polymers, wobei das wasserunlösliche, saure Kolloid des Melamin-Formaldehyd-Polymers enthält: (a) Melamin oder ein substituiertes Melamin; und (b) eine Verbindung der Formel:
    Figure imgb0003
     wobei R1 und R2 gleich oder verschieden sind und ausgewählt aus der Gruppe mit H und geraden oder verzweigten C1-4-Alkylgruppen.
  2. Verfahren nach Anspruch 1 zur Hemmung der Harzablagerung auf einer Pulpen- und papiermaschine bzw. -maschinenanlage und/oder zum Entfernen vorhandener Harzablagerungen von dieser Maschine bzw. Maschinenanlage, umfassend
       das Zugeben zu einem Beschickungs-, Ausgangsstoff- oder Papierherstellungsstrom, der Harz enthält und die Maschine bzw. die Maschinenanlage kontaktiert, eines wasserunlöslichen, sauren Kolloids des Melamin-Formaldehyd-Polymers.
  3. Verfahren nach Anspruch 2, wobei b) Formaldehyd ist.
  4. Verfahren nach Anspruch 2, wobei das Molverhältnis von a) :b) etwa 1:1 bis etwa 1:6 ist.
  5. Verfahren nach Anspruch 3, wobei das Molverhältnis von a) :b) etwa 1:1 bis etwa 1:6 ist.
  6. Verfahren nach Anspruch 1 zur Hemmung der Klebstoffablagerung auf einer Sekundärfaserpulpen- und papiermaschine bzw. -maschinenanlage und/oder zum Entfernen vorhandener Klebstoffablagerungen von dieser Maschine bzw. Maschinenanlage, umfassend
       das Zugeben zu einem Sekundärfaserbeschickungs-, -ausgangsstoff- oder -papierherstellungsstrom, der Klebstoffe enthält und die Maschine bzw. die Maschinenanlage kontaktiert, des wasserunlöslichen, sauren Kolloids des Melamin-Formaldehyd-Polymers.
  7. Verfahren nach Anspruch 6, wobei b) Formaldehyd ist.
  8. Verfahren nach Anspruch 6, wobei das Molverhältnis von a) :b) etwa 1:1 bis etwa 1:6 ist.
  9. Verfahren nach Anspruch 7, wobei das Molverhältnis von a) :b) etwa 1:1 bis etwa 1:6 ist.
EP93201240A 1992-05-05 1993-05-01 Hilfsmittel zur Kontrolle von Harz- und klebrigen Ablagerungen Expired - Lifetime EP0569085B1 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US07/878,637 US5286347A (en) 1992-05-05 1992-05-05 Melamine formaldehyde polymer for pitch control method
US878637 1992-05-05
US23988 1993-02-26
US08/023,988 US5433824A (en) 1993-02-26 1993-02-26 Melamine-formaldehyde polymer for controlling stickies

Publications (2)

Publication Number Publication Date
EP0569085A1 EP0569085A1 (de) 1993-11-10
EP0569085B1 true EP0569085B1 (de) 1997-01-29

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EP (1) EP0569085B1 (de)
JP (1) JP2559327B2 (de)
AT (1) ATE148512T1 (de)
AU (1) AU671444B2 (de)
CA (1) CA2095187C (de)
DE (1) DE69307767T2 (de)
FI (1) FI115476B (de)
MX (1) MX9302648A (de)
NZ (1) NZ247498A (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9505323D0 (en) * 1995-03-16 1995-05-03 Ecc Int Ltd Improved pitch control agent
US6235149B1 (en) * 1997-10-14 2001-05-22 Vinings Industries, Inc. Acrylic acid/maleic acid copolymers as detackification agents for adhesives contained in secondary fiber
EP1950342B1 (de) * 2007-01-29 2016-05-04 Cognis IP Management GmbH Emulsionen

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2986489A (en) * 1958-01-28 1961-05-30 American Cyanamid Co Melamine resin colloid and manufacture of wet-strength paper therewith
US3582461A (en) * 1968-02-14 1971-06-01 Diamond Shamrock Corp Pitch control in pulp and papermaking processes
JPS60259699A (ja) * 1984-06-05 1985-12-21 本州製紙株式会社 ゼ−タ−・ポテンシヤル調整剤
US4913775A (en) * 1986-01-29 1990-04-03 Allied Colloids Ltd. Production of paper and paper board
DE3741282A1 (de) * 1987-12-05 1989-06-15 Cassella Ag Leimungsmittel fuer papier
US5068279A (en) * 1989-01-12 1991-11-26 Calgon Corporation Low free formaldehyde melamine-formaldehyde detackifier and method of using

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Publication number Publication date
EP0569085A1 (de) 1993-11-10
ATE148512T1 (de) 1997-02-15
DE69307767T2 (de) 1997-05-28
CA2095187A1 (en) 1993-11-06
DE69307767D1 (de) 1997-03-13
FI932014A (fi) 1993-11-06
JP2559327B2 (ja) 1996-12-04
AU3837693A (en) 1993-11-11
FI115476B (fi) 2005-05-13
NZ247498A (en) 1995-08-28
CA2095187C (en) 2005-10-18
JPH06101193A (ja) 1994-04-12
AU671444B2 (en) 1996-08-29
FI932014A0 (fi) 1993-05-04
MX9302648A (es) 1994-05-31

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